Andrew t



tiititcii Qsiiiieii aient Giiiiit.

Letters Patent N 91,924, (lated func 29, 1869.

DdPROVEMENT IN WATER-FILTERS.

Tha Schedule referred to fn these Letten Plum! Ind mdd-ng part oid om To all nltom it may concern:

Be it known that- I, Axoiii-:w T. Duxsntzrt, of' thel city ol Pittsburg, iti the county of Allegheny, and' State ot' lenitsylrani.i, have invented a new and usci'iil Iinprorenieitt. in Water-Iriitcr, the same being an iittproreitieitt of the water-filter for which I received Letters Iatentof tite United States, which Letters Iateut bear date September 24, 186i; attii I do hercby declaro that thel following is u i'ull, cit-ar, and exact. desei iptioii thereof', reference being had to tite accoutpziuyiiig drawings, and to tite letters of rei'eroiice iiiarltcd thereon.

liie natureI ol my present improvement consists ln iitterposing between the itineranti outer shell oi'walis oi` the chamber l`or i'eeei\iii, v the filtered water, an airtiiflit space, through the niediiuii of which the condensation oi' tin.l attiiospiit-i'e on the outer wail of said watt-i'-cliaiiibtr is :ii-oitttl, thereby preventing the trickliiig and droppiio.l down ot" 1TH' caused by thc minimisation ol' the atmosphere oii tin: ottici' voili ol` said watcrchainhcr, wltcii it contains water tho ti-.iitporatiiie ot` which is lower than the atmosphere that itin-rounds the water-filter.

My intention also consists in the. use of a single. :tir-opening, placed below tlte filtering-inedinni, and so arranged tliatI it can be closed or partially closed, and thereby regulating the [iltcring-capacity ot' the. iilltt'. I

To enable otheis skilled it the art toiriake and usc in r invention, I will proceed to describe its construction and operation.

In the, aceonipaiiyiiii,v drawings, which form part oi` my spcciiiuition- Figure 1 is a iside elevation of my improvement in water-tiltei.

Iiigiiie .2 is a vertical section of the same.

In the dtawings A represents the liltci'ing-part oi' the filter.

'Iliis partis provided with a lid, C, and perforated disks c andf.

Un tln.l upper side of tltc disk n is placed a thick piece ol' tlaiini-l cloth, ora pit-ce el' wooilcii hlatiikct, tite dianictcrot which islioiiltl be a little more than the diameter of the disk e, so that, its outer edge or peripheiy will rest against the inner sui-face ol' the wall Oil tlicy lilieriiig-elialiibci.

'Iiic chatillon' is then charged with the filteringiiiatei-ial, which consists ol :i sciies ot` layers ot' woodcharcoal, arranged as ilillows:

'ilie hija-i' ot' t-liaicoal, which rests on the tiattiiel tltili oi l'f ..Kt't placed on tht: upper rido ol' thi: disk should' it small piccesot \\'tmd-i'.liarcoal, caeli plee.; iit-ii.,. 'in' size oi' :t halle-tint. This lltr't should consist of small grains of wood-charcoal, cach grain being; about the size of an culinary grain ot' wlicat, and this second layer should be about. two inches lu depth.

The third layer, which rests on the second layer, should consist ot wood-chaicoal, pulrerized very tine, :uid made. damp with wat'cr, and should be about ono ineh iii depth.

About ono inch above the third or upper layer of the wood-charcoal, is arranged tite perforated disk f.

AThe peri'oratiotis iii tho disks c and fsliould he. very small, with about. tivo perfomtions to cach superticiai hielt square otthe disks.

The lilter is madel iu two parts, A and B, and is joined or titted together at the. point marked h.

The opening x is used for the purposo ofadiititting :tir into the water-eltanibcr 1i, and for regulating the iiltering-capacity ofthe tiltcr.

Win-ii the op clt'ed, 0r partially closed,

` (.ilticli may ite oft a 'doodt-n pitten) the alteringproces will be slow, the full capacity oi' tite iiiter heini.' only obtained when opening x is entirely uustopped.

'.ltte part, Il is proi'idi-d with handlmi, marked g, and should bc provided with a suitable water-cock, secured in the opening i.

The mcse ol' the iiitcr may be made of wood, stone, pottery, titi, sheet-zinc, or sheet-iron, coated with any protecting-siilistauce, and maybe made in any forni or any size desired. By preference I make them oyliiidit'eal.

f, The following is tite operation otmy improved wateri ter:

Ilaring all things, constructed, arranged, and prepared as tiereinhetbie described, I put ice. iii the citamber It, i'or cpoiing the water, which is filtered lu chamber A. 'liiu water to be tiltered is pouied in ou tite disk f, from which it. fails in fine streams onv the upper layer oi' tho pulverized aitd damp charcoal, through which it passes tu tlte second layer, and trlekling dowu through it. and the third layer, and passing through the piece oi'tlaintei cloth 'or blanket, passes through tho pt-i-i'oiatioiis in thc disk c, drops down luto the chamber U, perfectly tiltered and putitied.

When thel upper surface oi'v the upper filtering-layer becomes foul or clogged, and thereby ltiopenitive, it. cati be made operative by removing about one-fourth oi'aii inch in deptlioi'the upper surtiiee-,uiid replacing i'rcsh ti'itcring-inaterial in tite stead ol'tliat removed.

The. iiilrantage ot' in r improvement iii water-tilter consists' iii pri-renting the. condensation oi tite atmosphere ou tito oiitt-i sorti-tee oi' the tiltcr, h r use ot` tite air-tight space. I) between tite trails ot the watcrchamber Ii, which 'space also :iets as :i uoirwnrluctor, and thereby sarei; icc.

By having n single :\ir-pns\:|;o` I, which may he dosi-ll or pnninlly dosi-il, Illu. lilluiinpproccm may be inrrmsml ni' diininishwl, nl 1h1- pli-:isnm n( the usvr.

l wish ily clwu-ly ninlvrstoml that I lo not clnini, lim'ull'x" Lhc usc of rlnuhlc walls in the conslruution ol' :1 water-filter, for snili llcvicv is old und wcll; known. i Ilnvini; thnx ilusvrihml lha nature, constructiomg nml npi-:irion of my iinprovwnent, i

what 1 clnilu as ol' my invention, is-

The arrangement of the air-tight Space D, and the singla.l opening I, when nseil in combination with n nzltcr-lli-r, proviilvd with disks f nml f, :ind filtering xnmlizi, th(` whole lli-ing vnnstrnctml, zu'mngcil, and opvmling substantially ns hvminlnforn described, and for tln` purpose set forth.

A. T. DUNSHBE.

Gm. H. THOMAS, AAuox B. GATE. 

